rule MAL_RANSOM_Darkside_May21_1
{
	meta:
		description = "Detects Darkside Ransomware"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://app.any.run/tasks/020c1740-717a-4191-8917-5819aa25f385/"
		date = "2021-05-10"
		hash1 = "ec368752c2cf3b23efbfa5705f9e582fc9d6766435a7b8eea8ef045082c6fbce"
		id = "e5592065-591e-597b-bebb-f20bc306fe52"

	strings:
		$op1 = { 85 c9 75 ed ff 75 10 ff b5 d8 fe ff ff ff b5 dc fe ff ff e8 7d fc ff ff ff 8d cc fe ff ff 8b 8d cc fe ff ff }
		$op2 = { 66 0f 6f 06 66 0f 7f 07 83 c6 10 83 c7 10 49 85 c9 75 ed 5f }
		$op3 = { 6a 00 ff 15 72 0d 41 00 ab 46 81 fe 80 00 00 00 75 2e 6a ff 6a 01 }
		$op4 = { 0f b7 0c 5d 88 0f 41 00 03 4c 24 04 89 4c 24 04 83 e1 3f 0f b7 14 4d 88 0f 41 00 03 54 24 08 89 54 24 08 83 e2 3f }
		$s1 = "http://darksid" ascii
		$s2 = "[ Welcome to DarkSide ]" ascii
		$s3 = ".onion/" ascii

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 200KB and 3 of them or all of ( $op* ) or all of ( $s* )
}